Screw-driving machine.



Patented May 18, 1909.

INVENTOR ATTORNEYS To all whom it may concern:

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SCREW-DRIVING MACHINE Be it known that I, EDWIN P. WANNER, a citizen of the United States, residing in New York city, county, and State of New York, have invented certain new and useful Imrovements in Screw-Driving Machines; and

do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

This invention relates to im rovements in 1power driven machinery by w iich screws or olts may be driven 'or forced into furniture or other kinds of woodwork.

The object of the invention is to provide a simple and efficient machine for driving screws or bolts into parts of furniture or the like; make provisions for automatically bringing the active elements into operation by presenting the work to the machine, and to allow the easy and proper introduction of the screws or bolts to the driver spindle, and-finally to provide means for ad usting the screw or bolt-guiding ferrule upon the driver spindle and further to prevent the marring and defacing of the wood when the screw or bolt is being driven home.

The invention consists in the automatically 0 erated screw or bolt driving machine, in t e adjustableimeans for engaging a screw nick and for keepin the screw in position relative to the splnd e, and in the combina: tion and arrangement of the various arts, substantially as will be herein more ful y described and finally embodied in the clauses of the claim.

Referring to the accompanying drawings in which like letters of reference indicate corresponding parts in each of the several figures; Figure 1 is a sectional view of a screw or bolt-driving machine embodying the features of this invention; Fig. 2 an end elevation of the driver spindle and its surrounding ferrule;'and, Fig. 3 an enlarged detail view partly in section of the modified form of driver s indle ada ted to receive the squared or angu ar head 0 a bolt.

In the drawings, (it represents a screw or bolt holder, in the form of an elongated spindle, having means for the reception of a screw or bolt in a manner to impart rotary movement thereto. In Fig. 1 said means Specification of Letters Patent. Application filed February 23, 1907. Serial No. 358,929.

Patented May is, 1909.

are represented by a nick engaging plate I), while'm Fi 3 said holder (1 is provided with a polygona or angular socket 0, adapted to receive the polygonal or angular head of a lag-bolt, as will be manifest. The spindle a may be of any desired length, and is mounted in suitable bearings d, d on standards e, e which may be erected on a bed or table f of any suitable shape or construction. 1

The spindle a, in the present embodiment of the invention, is adapted for rotary and endwise movement, and with said spindle is o eratively combined a driving mechanism w ich includes active and idle members, said members arranged to bebrought automatically into service on the presentation of the work to the driver splndle. This driver mechanism may be of any suitable construction, but as shown, the active member thereof is in the form of a pulley g, while theidle member is a clutch h. The active member g is loosely mounted on the spindle a at a point between the bearings d, and around said member or ulley g is arranged the driving belt 71, which may be propelled from an overhead shaft or any other suitable mechanism.

The idle member or clutch h is securely mounted on the spindle a, and is equipped with a clutch or friction face-plate m, adapted to on age the active face 'n, of the pulley g.

The c utch or friction face plate m maybe a layer of any suitable material applied to or secured on that face of the clutch disk which lies adjacent to the active face n of the ulley g, and this member or clutch dis is mounted on the spindle a to partake of the endwise adjustment thereof, thus disposing the member h for engagement with the running active member when an endwise move.- ment is given to the spindle a, by applying pressure through the work against the said spindle. normally held out of engagement with the running active member by [a suitable retraetor, which is represented as a s iral spring 0 coiled loosely around the spin e a, and having one end seated against a collar p, which is adjustably secured on the spindle by means of a set screw p. The other end of said retracting spring is seated against a Washer 12 having engagement with one of the bearin d, whereby the said s iral spring 0 normall y ushes against the co ar 19 to move the spindle in a forward direction and thus maintain the idle member or disk h in a lat- I the sleeve g and with its other end to the nut g. Said nut is adjustably mounted on the screw. threaded portion a of the spindle a, and is locked in its adjusted position by means of the auxiliary nut g. The outer end of the sleeve q is also provided with an annular flange g on whlch is revolubly mounted a guide ferrule r, surroundingthe end portion of the spindle a, and projecting beyond the latter and beyond the nick plate I).

' In operation, the spiral spring 0 presses the spindle a endwise to a position where the idle member 7:. is free from engagement with the running member g. The operator places the headed end of the screw into the ferrule r so that the screw will be guided by the said ferrule to a position where the nick late b of the spindle will enter the nick in t e screw head, and, meanwhileholding the screw with his hand, he brings the work A (indicated by dotted line in Fig. 1) up to the screw and causes the work to press against the screw and thus force the spindle a back-against the action of the spiral spring 0until the face-plate comes against the pulley, whereupon rotary movement is imparted to said spindle thus driving the screw into the work. As the operation of driving in the screw is about to be completed the ferrule 1" comes against the work and yields rearwardly, together with the sleeve gagainst the action of the spiral spring g but as the said ferrule 1' is revolubly mounted on said sleeve q, the

latter rotates while the ferrule stands still screw; and the wood being soft, so that the screw enters the same comparatively freely at the start, one can afford to set the ferrule back in this manner without detracting from its action as a guide for the screw. Of course it will be understood that according to the hardness of the wood so the sleeve 9 must be adjusted to give more or less guiding capacity to the ferrule r.

Havin thus fully described my invention, what I cfaim as new and desire to secure by Letters Patent is:

A screw or bolt driving machine having a screw or, bolt holder, said holder beingeXternally threaded, a nut screwed onto the threaded portion of said holder and adjustable thereon, a lock-nut also screwed onto said threaded portion in contact with said first-named nut, means for rotating the holder automatically when pressure 1s applied thereto, a yielding sleeve rotatingwith said holder, a spiral spring coiled about said holder and having one end 'fixed in the first-named nut and the other endin the sleeve, and a screw-guiding ferrule revolubly mounted on said sleeve, substantially as described.

In testimony, that I claim the foregoing, I i

have hereunto set my hand this fourth day of February 1907. I

EDWIN P. l/VANNER. 

